Legal claims defining the scope of protection. Each claim is shown in both the original legal language and a plain English translation.
1. A liquid crystal display device that performs phase inversion drive in which a phase of a polarity of a data voltage is inverted in predetermined timing while performing frame inversion drive and polarity inversion drive, a positive-polarity data voltage and a negative-polarity data voltage being alternately output to a data line in each one or plurality of frames in the frame inversion drive, the polarities of the data voltages supplied to two adjacent data lines differing from each other in the polarity inversion drive, the liquid crystal display device comprising: a source driver that outputs the data voltage to the data line; a pixel electrode to which the data voltage is applied; and a common electrode that is disposed opposite to the pixel electrode and to which a common voltage is applied, wherein in a first frame immediately after the phase is inverted, the source driver performs short-circuit processing, in which a first data line to which a data voltage having a first polarity is supplied and a second data line to which a data voltage having a second polarity different from the first polarity is supplied are alternately short-circuited, and stops output operation of the data voltage performed on the first data line and the second data line, in initial first periods of a horizontal scanning period, and releases short-circuit states of the first data line and the second data line, and outputs a data voltage corresponding to input image data to the first data line and the second data line, in a second period after the first period in the horizontal scanning period.
A liquid crystal display device performs phase inversion drive, where the polarity of a data voltage is inverted at predetermined intervals, while also performing frame inversion drive and polarity inversion drive. In frame inversion drive, positive and negative polarity data voltages are alternately output to a data line in each frame or multiple frames. In polarity inversion drive, the polarities of data voltages supplied to adjacent data lines differ. The device includes a source driver that outputs data voltages to data lines, pixel electrodes to which the data voltages are applied, and a common electrode opposite the pixel electrodes, which receives a common voltage. During a first frame immediately after phase inversion, the source driver performs short-circuit processing by alternately short-circuiting a first data line (supplied with a first polarity voltage) and a second data line (supplied with a second polarity voltage). The source driver stops outputting data voltages to these lines during initial periods of a horizontal scanning period, then releases the short-circuit states and outputs data voltages corresponding to input image data in a subsequent period of the horizontal scanning period. This reduces display artifacts caused by phase inversion.
2. The liquid crystal display device according to claim 1 , wherein the source driver performs the short-circuit processing in all the frames, and lengthens the first period in the first frame compared with the first periods of other frames.
A liquid crystal display device includes a source driver that performs short-circuit processing to reduce power consumption by temporarily disconnecting the source driver from the data lines during non-display periods. In this device, the source driver executes the short-circuit processing in every frame of the display operation. Additionally, the duration of the first period, which is the interval between the end of the display period and the start of the short-circuit processing, is extended in the first frame compared to the first periods of subsequent frames. This adjustment helps stabilize the display output by allowing sufficient time for the liquid crystal elements to settle before the short-circuit processing begins, particularly in the initial frame where transient effects may be more pronounced. The extended first period ensures smoother transitions and reduces visual artifacts in the first frame, while maintaining power efficiency in subsequent frames. The device is designed for applications requiring consistent display quality and energy efficiency, such as portable electronics and high-resolution monitors.
3. The liquid crystal display device according to claim 1 , wherein the source driver performs the short-circuit processing in all the horizontal scanning periods.
A liquid crystal display device includes a source driver that performs short-circuit processing to reduce power consumption and improve display quality. The device addresses issues such as power inefficiency and signal distortion in conventional displays by actively managing the electrical connections between components during operation. Specifically, the source driver conducts short-circuit processing in every horizontal scanning period, ensuring consistent signal integrity and minimizing power loss. This approach prevents voltage fluctuations and signal degradation that can occur during data transmission, leading to a more stable and energy-efficient display. The short-circuit processing is applied uniformly across all horizontal scanning periods, enhancing uniformity in the display output. The device is particularly useful in high-resolution displays where precise signal control is critical to maintaining image quality while reducing power consumption. By integrating this short-circuit mechanism into the source driver, the display achieves better performance with lower energy usage, making it suitable for applications requiring both efficiency and reliability.
4. The liquid crystal display device according to claim 1 , wherein the source driver performs the short-circuit processing in the first frame, and does not perform the short-circuit processing in frames other than the first frame.
A liquid crystal display device includes a source driver that performs short-circuit processing to reduce power consumption during display operations. The device addresses the problem of excessive power consumption in liquid crystal displays, particularly during initial frame rendering or when transitioning between display states. The source driver selectively applies short-circuit processing only in the first frame of a display sequence, while omitting this processing in subsequent frames. This selective approach ensures efficient power management by reducing unnecessary current flow during initial display activation while maintaining normal operation in later frames. The short-circuit processing may involve temporarily connecting specific signal lines or components to minimize power dissipation during the first frame, where higher current demands typically occur. By limiting this processing to the first frame, the device balances power efficiency with display performance, avoiding unnecessary energy consumption in subsequent frames where such processing is not required. This method is particularly useful in battery-powered devices where minimizing power usage is critical.
5. The liquid crystal display device according to claim 1 , wherein in performing n-dot inversion drive (n is an integer of 1 or more), the source driver performs the short-circuit processing in each horizontal scanning period in the first frame, and performs the short-circuit processing in each n horizontal scanning periods in frames other than the first frame.
A liquid crystal display device with an improved driving method for reducing power consumption and display artifacts during n-dot inversion drive. The device includes a display panel with a plurality of pixels, a source driver for supplying data signals to the pixels, and a gate driver for scanning the pixels. The source driver performs short-circuit processing of data lines to stabilize voltage levels and reduce power consumption. In the first frame of the n-dot inversion drive, the source driver performs short-circuit processing in every horizontal scanning period. In subsequent frames, the short-circuit processing is performed less frequently, specifically in every n horizontal scanning periods, where n is an integer of 1 or more. This selective short-circuit processing reduces power consumption while maintaining display quality by balancing voltage stabilization and power efficiency. The gate driver controls the scanning of pixel rows, and the source driver adjusts the timing of the short-circuit processing based on the inversion drive pattern to optimize performance. The method ensures uniform display quality and minimizes flicker and image retention issues.
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February 11, 2020
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